I'm not a fiberglass expert by any means but this is what I've done. First you need to figure out what kind of fiberglass you have fiberglass or SMC fiberglass is kind of a clear yellowish color SMC is gray in color and get the right resin for it. If you're not sure they make a resin that works on fiberglass and SMC talk to your bodyshop supply place. get a piece of wood from home depot 1x2 or 2x2 whatever you have room for under the hood. Cover the wood and your work area surface with clear plastic packaging tape then spray the tape with Pam cooking spray use some fiberglass mat and resin and cover the wood with it on 3 sides making a -U- shape. Let the mat and resin run out onto your work surface about a half inch to make a -U- shape with wings on the top. Let it set up then remove the fiberglass from the wood and work surface clean the piece with wax and grease remover (from bodyshop supply place) cut your piece to fit under the hood scuff the bottom of the hood and the top of the piece you made with 120 grit sand paper and bond it on using panel adhesive or fiberglass resin. For the corners of the hood that you said are rounded off grind the top of the hood back about a half inch on an angle put a piece of packaging tape on the underside of the hood sticking out over the edge of the corner. (> Don't use the Pam cooking spray on this repair < ) Use long hair fiberglass filler to make your corner. Pull the tape off after it sets up then shape it to fit.